Track grinder



H. H. TALVBoYs GRINDER Filed/Nov. 1v1, 1952 '7 Sheets-Sheet 1 nimm ,za d l mi M W if f wx @RN nl Nj lw w @w Lw 7) W @w@ A N T\\ X, ER wlw, |x ww www Feb. 12, 1935. H. H. TLBoYs TRACK GRINDER Filed Nov. 11, 1932 "i` Sheets-Sheet 2 'n Feb. 12, 1935.

H. H. TALBoYs TRACK GRINDER i Filed NOV. l1, 1932 Febt 12,` l1935. H. H. 'rALlaoYsA v TRACK GRINDER Filed Nov. 11, 1952 7 Sheets-Sheet 4 l Feb. l2, 1935. H. H. TALBOYs TRACK GRINDER Filed Nov. 11, i952 7 sheets-sheet 5 [71 Vezza/*07 few/yg 75l/aya H. H. TALBOYS TRACK GRINDER Feb. 12, 1935.

'7 She'bS-Sheet 7 Filed Nov. 1l, 1952 Patented Feb. 12, 1935 1 franck .GRINDER 1 c Henry H; Talboys, iMilwaukee, WS., vassi'g'nor `"to 1 1'NordbergManufacturingiCo^.,1fMilvvaukee, Wis., 1

` arcorporationiolWVisconsin 1 1 f lllicatm Nvmber'llgwaz, sriaiNo- 642,160 1 1 1 1 iiolainms.1 (61115151781) l1 1 Silly/invention relates to 1an improvement1 .in track for mail grinding mechanisms 1land :their method off'use. zOne :object is the provisionof a 1 light ilicient readily operated track grinder. Another 1object :istlie provision 11of :a track grinder a11singlez1power plant :mounted thereon1 1 and a11plural1ity1.of1track grinding elements alternately-'driven from' saidzsingle power plant. Anf` 1 other 'objectis the provision lofirnproved guiding means for a: guidedtrackgrinding element.` Another-object is thezprovision ofimproved means fcriadjusting and` adjustably supporting 11 a track grinding element. Another objectzis the provision of improvedzmeans formanually moving1 the track grinder f along dihe track. Another object 1 is1the1provi'si1on of improved means 1for turning said track :grinder to reverse or change itsdirec- 1 tion 1on1 a1 track.4 I Another :object the provision 0f improved means for :varying 1.or 1controlling fthe levelfof 11the111grinder felement; when it is 1necessary to grind oi unjeven parts fof11op`pose`d11rail ends andwhen it 1 necessary to .grind downzthe edges of apertures 1'inn-the 11rai1 tops. Other objects 1will appearxrfrom 11 time to 111'time 1 the .course 1of`11the speciiicationandclaims. 1 l 1 1.11 illustratel my.' invention more 11er less diagram# matically in1: the 1aec'cimpa'nying 1 drawings, where'in-` 1 1 i1 is a 1side1elevation; 1

Figure 2 is a plan View;

ure:2;11 1 11 1 :Figure 4111s a.1section on ctheiline of 1.Fig--1 ure 2'; 1 1 1 1 for varying or controlling theflevel of the grind-1 1 ing member;

11Figure 1l1is asimilar view illustratinganother method ormeans for controlling such-level;

VFigure11121is111za rsectionzon"the-line 1121-112 1of 1 figure -111;;1 1 1 11 Figure `13 is a detail 1of1'the1llevelvaryingwdevice1-shown ini Figure 11i-1'; 1 1

114 :is a side 1elevationillustratinga1va-` `elevation, similar to Fig-11 riantform of manually movingthe grinding 1device;;and.1 1' 1 1 1 j Figurel is asection on the line .15-15 of Figure 14.1 1 1 1. 1 V1 Like -;parts are indicated 'by like symbols throughout .thespecication anddrawings.1 1

1 VReferringgto thedrawings, Agenerally indi- Cates ,railroad tieseupon which are mounted 1a pluralityof1 rails1A11A1. 1

1B is alongitudinally extending frame member at oneside of the1-'frame1-1 Secured to the upper face thereofV are 11-bearing1sleeves Bl B1 Aat opposite endsthereof. B21 indicatesahandle secured to one endof theframe memberB, it being understoodthat alsimilar handle could if "desired be positioned also at the ,opposite1 1 end. B3 jgenerally indicatesan irregular shaped frame .member11at111the opposite side-of the frame, which may include short lend 1bars B4,1be1neath which are secured the bearings. B51. The bars B4 are united byfthe angular -member B6 and stiffening bars BL 'I'he11angular member B6 `maybe bracedas by the ,bar B8. x Tnefbars B11-B61, 137 .and Bfare 1 preferably o fsquare tubing and may befwelded 1.1 together. `The cross members Band B31aregjoin'ed,

by .means of two parallel :bars B91, B191 which are 4braced by `means of 11cross1 members B111, B12,1 B13'1`and B14. The labove described members corny-f` prise a main frame iwhich is supportedfupon iiangedwheels Bl and may bemoved along the rails :AL Referring to Figures 2 and 5 I have shown thewheels B16 mounted upon1thetrans-1 1verse Yshafts B17 supported inthe bearings B1,

` B5. 1vAs illustratedin--Figure 5, the'set of Wheels adjacentjthe cross member B1 are electrically in- 1 1'1sulated111from the shafts by means of'the Washers andntapered sleeve B18 1of1 insulating material, 1

and ,may bexedto 1the1shafts. The wheels1B11.6 upon .the oppositeend of the shafts may be l mounted to Ibefreeto rotate about the shafts.1

1 1One VAorboth of the Wheels adjacent the` cross 1 member1 B3 may beprovidedwith a handle B210 111 `hav1ing1`locking pins C21. ',Therangle'bars or clips arefsecuredfto fthebarsp? B1101by means of bolts y prevent displacement of the sub-framev and-fun` thermoreto eliminate unintended 4longitudinal C3, screw-threaded into nuts C4 which are shown as welded to spacing members C5 for ease of assembly. Each guide member C is provided with a V-shaped groove C5. Positioned within said grooves are one or more balls or rollers C5. Referring to Figure 5, I have illustrated two of such balls C5 which may be held in proper relation to each other by means of Va spacing memberC".y

Supported upon said balls or rollers are the track or guide members D having grooves D1 which are engaged by the balls C5. Note that the balls engage the grooves of the track mem-v bers at two points only, thereby reducing friction. The guide members D are mounted be`-, neath a movable sub-frame generally indicated as D2. Identical means` of mounting as employed for tracks C are used and a's such lettered.

Referring to Figures 4, 5, 8 and 9, the subframe D2 comprises a pair of frame members D3 to which the tracks D are secured. Welded or otherwise secured` to the frame members D3 are the reinforcing plates D4 to which are Welded spacing or tie channel irons.D5 and a bar D5. The members D3 D5 may be of square tubing as shown. Welded to the bar D'and one of the channel irons D5 is a circular rod or tubing D1, adapted to be engaged between the V-shaped roller E and the roller E1, as illustrated in Figure 7. vThe roller E is mounted upon ra Xedpin orbolt E2 `in the U-shaped bracket E3. The roller E1 is heldin frictionalv engagement with the rod Dr1 as by the shaft fE4 mounted'in the slidable bearing member orifork E5 Which'is downwardly thrust by means of-.the spring E5, the tension of which'may be adju'stedby means of the adjusting nut E7 upon the screwthreaded portion E3 of the fork E5, theipor'tion' E5 being 'positioned and guided in an aperture E5 in the bracket E3. Likewise the shaft E4 is guided in elongated apertures E1o in said bracket. The bracket E3 is Welded to 'a base plate-E11 which is adjustably mounted by means of `shims AE12 and bolts E13 to the cross member B13 of the main frame. `As above described the sub-frame D2 isheld in sliding relationship withthe main frame by meansof the circular rod D7 and the grooves D1 of the tracks D engagingthe balls or rollers C6. In order to movement of said frame and associated parts I provide a pair of friction rollers F, engagingthe reinforcing plates l'D4 as indicated in detail Ain Figures 3 and 5. Each'roller is'mounted upon ar pin F1 integral with the rod F2 at right angles therewith. The rod F2 is screwthreaded as at F3 to receive the adjusting nuts'F4 which support `a bearing sleeve F5 slidably mounted .in a tubular grinding member F5. F1 indicatesv a Vbearing plate secured in the memberF6 which serves as aguide -for the rod F2 adjacent the pin F1. Compressed between the bearing plate'Fff and the Welded to the lower flanges lof the channels' D5 of the'sub-frame are the split bearings G which include the removable caps G1 and locking screws G2; Mounted for rotation in saidlbear-` ings are split bushings G3 which are secured in any suitable manner to a bearing sleeve G4. The sleeve is apertured as at G5 and counter-bored to receive the ball bearings G5 in which is mount ed a stub shaft G7. G8 is a grease fitting for lubricating the bearings Gs and G9 indicates a packing ring. The stub shaft is screwthreaded at one end to receive a lock nut G10; theopposite end which may beA of smaller vdiameteris connected by means of a flexible union G11 to an extension shaftI G12, which in turn is positioned within a driving sleeve G13 having a plurality of keys G14 adapted to engage opposed keyways G15 in the shaft G12.. As will be seen in Figure 4 the shaftv G12. is vslidably mounted in the driving sleeveG13 giving in eifect a telescoping action.

. The driving sleeve G13 is journalled in roller bearings G16 in a bearing housing G1rl which is secured as bythe bolts G111 upon the cross member B12 of the main frame. G19 indicates a clutch shift leverrn'ounted 'upon the transverse cross-bar B13 adapted to operate the clutch G20, one part fof which is splined to the driven shaft G21 integral with the sleeve. G13, the oppositeclutch" member of which is secured upon the drive shaft`G22 of any. suitable internal combustion engine or mo# tor, diagrammatically indicated as G23. The motor may be mounted in any suitable manner upon the transverse framefmembers B, B14 and may be shielded as illustratedin Figuresr 2 and 6. u

Referring to Figures 1, 3 and 4, the bearing sleeve G4 is provided with a lugor arm G25 upon which is adjustably mounted a lug H1 integral with the bearing member H. Adjustment is permitted by means of the. slots H2 in the lug H1, penetrated by the locking bolts H3. Thebearing member -is apertured as at H4 and 'counterbor'ed to receive the ballbearings H5 in which is jour.-` nalled'the "shaft H5. .The ball bearings H5 may be. lubricated bymeans of the grease fitting H1; The shaft H6 is reduced in diameter as. at H5 upon which is secured, by means off the discs H9 and lock nuts H10, threaded upon the screw;` threaded end H11 of the shaft, any suitable grinding wheel H12. H13 indicatesa .pulley keyed to the shaft H5,` which is actuated by means of one or more belts H14. which passabout the pulley H15 keyed to the driven shaft G1. Hlindicates a semi-circular guard or housing for the grinding wheel. f 1

In order to raise and lower the grindingwheel,

provision is made for rotating the bearing sleeve G4 and associated parts aboutan arc, the axis of rotation being the shaft G". y Referring to Figures 1, 2,4 and 6,; J indicates an extension sleeve, which may be secured upon thebearingsleeve- G4 as bythe screws J1. The sleeve vJ is provided at its outer end with a flange upon-which is mounted as by the bolts J2. a gear segment J3 which meshes with a pinion J4 upon the shaft J55. J5 indicatesv aybearing sleeve or tubing welded upon the upper flanges ofthe chan` nels D5 on the sub-frame D2 in which theshaft J5 .is mounted. The bearing sleeve J6 ismslotted as at J? about the pinion J4. The shaftjJ5is actuated' by means of the hand wheel J 11. In order to prevent unintended rotation of the shaft, I have provided friction blocks J9 bearingy against the periphery of the hub of the wheel J 8and portion of the sleeve J5. i The amount of friction of the springs J11 about the boltsJ11 compressing the blocks J9 may be adjusted by means of the nuts J12 as illustrated. in FigureQ.y

It is essential to hold the shaft H6 supporting the grinding `wheel H12 rigid in its adjustedy position. In order to prevent'any lost motief-rv betweenI the gear teeth of the Vpinion 54 andigear:l segmentV J 321 pro'videon'e` or more compression .springs 5'1". with lone fend anchoredonnanod 1.116 welded to thessub-frame D29 The oppositer-endsfare fastenedv to :angle clips .J1'1 which k.are secured :to fthe; vlug or arm H1. i `Some of the bolts H3 may .belutlized for fastening; l i w l :Referring `to Figures 1l, 2, -4Land 6,` I have illus-` trateddriving meansforfaffurthergrindingwheell Mounted upon the driving sleeve G12is :afpulleyK about which passes the belt K1 adaptedvto drive the l p`u1leyK2 secured to theshaft. K4 indicates ia AVbearingfsleeve for :said shaft `which iis Welded 'to oneor Amore `arms Kfpivoted :as lat K6 to anyisuitable abutments K7 -on the main iframe.

One ofthearmsextends beyond fthe '.pivotfas shown in Figure "6, 4at which endla spring 1K2 is attached.. 'The opposite end `of the spring is secured to la chain K9 which `mayibeifasterredto any suitable hook` or slottedv abutment 'K12 ion' the frame lmember B9. The function =of the spring andichain are to rotate the arm K5 4clockwise and toftighten the belt K1 upon the pulleys K, K2;

which establishes adriving connection. The vpul-` "f utilized `Ito drive a Iflexible shaft V K13 in a casing K14. `The opposite'end of the ilexible shaft may through any suitable driving "connection `operate a grinding Wheel K15 which maylbe provided with a housing Klhaving one 4or more handles K12. K12 `indicates a supporting bracket lforfthe flexible shaft. i i i It will be realized that Whereasl vhave described and shown apracticaland `operative device, nevertheless `many changes `might be made inthesiZeashape, number and-'disposition o'fpaits withoutkdeparting from Ithe `spirit of my finven tion. I therefore wish my descriptionand drawings `to `betaken as in abroad sense illustrative andl diagrammatic, rather than as limiting fme 5to my speoicbshowing.

Forexample, whereas in .thedrawirrgs I illustrate the Wheel :H12 `as lying in a plane generally parallel with the longitudinalfvextension ofthe rail Ifmd that lfrequently in practice itis preferable jslig'htlytc tilt` the axis of rotation of the grinding Yvvheelrso that as the `grinding' wheel .of the `grinder is moved across the intersection"between tworail endsiit `will lnot drop into the space betweenithe railsiorltend to trough out or deepen the rails,'but will grind inla substantially parallel` planelevel to theltop of the rail. It isexceedingly desirable to avoid anywbevelingoff iof the rail ends as this imerelyxaccentuates the condition -which the present apparatus 'is usedto avoid. i

*Theuse and operation oi my invention are 'as Thettrack grinder generally "consists `of l a main` framestructure supported onlflanged wheellsupon a track and `may be moved along the trackf'by F i `the handles B2. Provision isalso made for fastening any' suitable 'towing bar or handle to either one of the connecting abutments B25 `with their 'asso-` elated pin or bolt. One set vof Wheels irl-contact l with one ofthe rails maybe electrically insulated from their-respective shafts in `order toprevent anyfinterference with the usualelectricalsignal` system employed by railroads. Mounted for .lon'

baills'or lrollers fCS, and bythe extensionlltube D1 supportedbetween the `rrollers `E E1.

vided bymean'so'f `the spring thrust roller E1 `and the friction rollers 1i'` bearing 'upon the .plates CD4 above the grinderD, toleliminateunintended longitudinal movementfof-the frame after it .has been adjusted. v"Ihlefrction of the rollers "E1 and'F are adjustable.` 'The -subeframe carries inV bearings G G1 the sleeve G2 which `inturn supports in bal-l bearings the shaft G7; fThe' arm G25 ofthe Sufficientv pressure upon :thefsub-frame lstructure D2 is `probearing sleeve G4 carries thevbearing memberH which supports the shaft HG-upon which is-secured any suitable grinding wheel H12. The shaft H6 is driven by tmeans `of the Ypulley H13 actuated by theb'elts H12 about the Idriving .pulley H15 which is keyed to the shaft G7. 'The belts H14 may be tightened about their pulleys in case of wearl by means of the slots H2and `locking bolts HQ The shaft Gr7 'is connected by means of a iiexible coupling `with the shaft G15 splined to the sleeve 5G12 which 1in turnis-connected by means ofthe clutch G22 to the drive shaft G22 of anysu'itable motor or combustionengine. The bearing sleeve G4 is pro.-

vided with a gear segment; J3 in mesh with the pinion J4 'upon the shaft Jwwhi'ch is rotated by means of `the wheel J2. It will be seen from the l drawings thatfby rotating :the wheel J 2 the bearing sleeve 'G'1 is rotated and the bearing H which sup-f ports "the shaft H6 is swung about an arc, thus eitherlowering or raising `the grinding wheel H12;

depending 'upcnwhich direction the hand wheel J 8 is turned.- To prevent lost motion between the gears, and furthermore to create sufcient fric-7 tion" to eliminate unintended movement of the A ing. The operator-may now position the" grinder and by means of the vhand VWheel J8 `pull out if necessary 'the' ysub-frame `assembly andY place the grinding wheel H12 above the rail to `beground;

Then 'by *rotating the `hand Wheel clockwise he may lower the grinding WheelA until it comesin 1 YContactwiththemetal to be ground off. He 'may nowgeither by mans Of 131131121111162320 rotating-thewheel "B21 on the `iiangedvvheel B16; guide thetrackgrinder back and forth and thus grind olf the surplus materia-lof the rail. f The grind ing wheel may `also be' adjusted and`lowered to grind `oif leither sideof the trail.` The rotation of the; grinding Wheel is -in the direction of the arrow in Figure l.` In ordertoyprote'ct 'zhestruc-` ture of the grinder adjacent the grinding wheel and particularly the iiangedwheelin line With l the spray of `ground -oif particles, the grinding wheel is provided with a 'guard H16 andY an additionalwheel guard B26 is. suspended in any suitable manner about theexposed flanged -Wheel B16, tc whichl `some of thehot particles wouldv `adhere and destroy its true periphery which is very essential to produce a level surface ofthe rail." f

Referring to`Figure l0 [have illustrated a method of grinding a rail which has been Worn intcdepression by "the spinning Wheels ofv locoing wheel has been adjusted just to contact the motives. The rail A1, having a depression M, is preferably ground away as indicatedrin dotted klines and marked as M1, so as to taper both ways vforming a` gradual incline from the depression surface of the rail A1, the grinding wheel may grind 01T the surface of the rail so as to obtain a contour similar to the inclined faces M3 as the grinding member M2.

Another objectionable defect of tracks is adv joining rail ends of different heights, as illustrated in Figure 11. As shown, the rail N being of greater height than the rail Nl may be ground 01T as indicated in dotted lines and lettered N2, to form a long tapered surface towards thelower rail N. The taper may be very small, for eX- ample, it may berseven thousandths of an inch per inch. This grinding operation may be facilitated by means of a guide member N3 positioned on top of the rail N, having a tapered surface N4. Thus, by moving the track grinder to the dash and dot line position as illustrated in Figure 11, the rail N may be ground away as indicated at N2. The guide member N3 is preferably slightly curved as illustrated in Figure 13 when in inoperative position,` its function being to bite into ythe rail at either end when the cross grinder is positioned thereupon. This prevents a tendency to turn or dislodge the member N3 during grinding. The guide member M2 may be curved identically when in inoperative position.

In Figures 1 and 2 I have illustrated an additional independently handled grinder or cutter X15 whichmay be used for` grinding the edges of opposed rails for proper rail clearance. This grinder is driven by means of the exible shaft -Kl3 which may be actuated by means of the pulley K2. Driving connection is made by means ofthe belt K1 about the pulley K, whichv in turn is secured upon the driving sleeve G13. The pulley K2 may berendered idlebydisconnecting the chzainiK9 on the-spring K8 which allows thearms K to rotate counter-clockwise andthus loosens the belt K about its pulleys.k The motor` G23 is adjusted to drive yeither grinding element. The cross grinder may further be provided with a'tool basket P. Y

Should it be desired to repair the opposite rail, the cross grinder may easily be turned upon `Ya stand Q illustrated in dotted lines in Figure 6, which may be positioned upon a tie A beneatha socket Q11 upon the cross grinder. `It may then be raised by means of a screwthreaded member Q2 scre'wthreaded in the stand Q and one end seated in the socket Q1. Afterl the cross grinder is sufficiently raised above the rails it may easily be rotated. K l f If the use of the grinding wheel K15 is not desired, or if the cross grinder is moved along f the track, the` flexible shaft in the casing may driving connection' Vbetween `said element and said powersource, and a carriage for said grinding element, said carriage being mounted for movement upon said frame, said carriage and adjacent portions'of the frame being provided with a plurality of opposed tracks, and an additional supporting connection for said carriage, positioned between said tracks, and anti-frictional means associated with said tracks and with said additional connection, adapted to maintain a three-point the frame. f y

2. `In a track working machine, a frame adapted tospan the rails of a track, rail engaging wheels at each side of said frame, apower source mounted on said frame, a grinding element and a driving connection between said element and said power source, and a carriage for said grinding element, said carriage being mounted for movement upon` said frame, said carriage and adjacent portions of the frame being provided with a plurality of opposed tracks, and an additional supporting connection for said carriage, positioned between said tracks, and anti-frictional means associated with said tracks and with said additional connection, adapted to maintain a three-point support ofthe carriageupon the frame, and means for normally urging the carriage downwardly against the frame. 3, In a track working machine, a frame adapted to span the rails of a track, rail engagingA wheels at each side of said frame, a power source mounted on said frame, agrinding element and a driving connection between said element `and said power source, and a carriage for said grinding element, said carriage being mounted ,for movement upon said frame, said carriage and adjacentportions of the frame being provided with a plurality of opposed tracks, and an additional supporting connection Yfor said carriage, positioned between said tracks, and anti-frictional means associated with said tracks and with said additional connection, adapted to maintain a three-point support of the carriage upon the frame, and means for normally urging the carriage downwardly againstthe frame, including rollers engaging portions of the carriage adjacentsaid tracks, guiding and supporting means for said rollers mounted on the frame and yield-` ing means for urging said rollers downwardly against the carriage.

4; yIn a trackfworking machine, a frame adapted to span the rails of a track, rail engaging Wheels at each side of said frame, a power source mounted on said frame, a grinding element and a driving connection betweensaid element and Said power source, and a carriage for said grinding element, said carriage being mounted for movement upon said frame, said carriage andan adjacent` portion of the framebeingprovided with opposed tracks, roller members intermediate said tracks-and yielding means for normally urging the carriage-tracks downwardly toward the frame tracks and against'said roller members, in-

support of the carriage upon ed to span the rails' of af track,A raill engaging wlieelsatr each side ofsaid' rame', afpower source mounted on said frame, ai grindinge'lenent and a driving connection -betweensaid element"` and 'said power sonrce; and a carriageffcr saidg-rinjdingv element, said carriage- {beinrgmountedlj for Lmovement upon saidfranie,` and means ffor'movir ingsaid-"frame alongy the track,l including; man# wheels, said 'handles' including?y arcuated handf ena 'gagingfpertions' generally concentric with the axes ofirotationof the wheel'Sf" l Y '7. -In a trackfworkingmachine; 'a frameiadaptL edgto spandtherailsuovf a track, a plurality-[of wheels on*eachfsi'deofi said frame, adapted to engage the rails of said track, a power source n mounted on said frame, a grinding element and a driving connection between said grinding ele-` ment and said power source, and acarriage, upon` which said grinding element is mounted, said carriage being mounted for transverse movement upon said frame, and an arm, rotatably mounted on said carriage, said grinding element being rotatably mounted upon `said arm, means for ad justing said arm including a segmental gear `axially spaced from said arm and at an angle thereto, means for holding gear and arm against relative rotation, a pinion in mesh with said gear,

, andmanual means for rotating said pinion, and

yielding take-up means for the play of gear and pinion. f i

` 8. In a track working machine, a frame adapt` ed to span4 the rails of a track, a plurality of -wheels` on each side of said frame, adapted to engage the rails of said track, a power source `mounted on said frame, a grinding elementand a driving connection between said grinding element and said power source, and a carriage, upon which said grinding element is mounted, said carriage being mounted `for transverse movement upon said frame, and an arm, rotatably mounted on said carriage,` said grinding element Vbeing rotatably mounted upon said arm, means forl adjusting said arm including` a `segmental gear axially spaced from said arm and at an angle thereto, means. for holding gear and arm against relative rotation, a` pinion in mesh with vsaid gear, manual means for rotating said pinion, yielding take-up means for the play of gear and pinion, and means for adjusting the effective length of the arm.

9. In a track working machine, a frame adapted to span `the rails of a track, a plurality of wheels on each side of said frame, adapted to` engage the rails of said track, a power source` mounted on said frame, a grinding element and a driving connection between said grinding ele-` ment and said power source, anda carriage, upon l i which said grindingl element `is mounted, said carriage being mounted for transverse movement c. matiackworkingmachma maande-adapta f lsaid contactpoints, said rollers being portionof-the framebeing provided with opposed `apensaiul frame, said" carriage andfarivadjacene j contactingmembers adapted tomaintain; al threen point contact between carriagei and frame; includingtwocontact points, one adjacent eachside l, otthecarriage-andadjacentonefside ofthe frame, i

and a third contact point `interposed betweenthe `firent andrearof thefcarriage and intermediate thesides of thel frame, the three pointsfbei-ngfsunicientlywidelyr spaced? vtoprovideia firm, `support Vfor thevcarriage asfaiwhole;` f f s, 9 .L

. g-r In atrackworking `machine,.a frame adapt-'- ed: to span the rails; of `a track; aaplurality` of wheelswon'i each sidehof said frame, adapted-to` engagefthe rails. ofi said`` track, `a power source ahdrivingf` connectiontbetween said grinding eleimend and .said Ip'ower source,` and a'c'arriage, uponwhich said grinding element is mounted, saidcarriage being mountedfortransverse move-` i ment uponisaid frameglsaid carriage and anadf jacent` port-iorr of the frame` beingpi'ovided with opposed contacting members adapted to maiin` tain althree-.point contact between carriage and `frame, `including t-wo Contact points, one adjacent v,each side of thefcarriageand adjacent vone, side of thef'framav andathirdicontact `point interposed i between the front and' rear of the? carli `riage and intermediatethefsides1oflthelframe, `the vthreep'oints being' sufficiently widely` spacedto provideaa rm. support fori the =`carriagej as va Whole, and roller means positionedatl'sucnfcon tact points. l

11. In a track working machine, a frame adapted to span the rails of a track, a plurality of `wheels on each side of said frame, adapted to engage the rails of said track, a power source mounted on said frame, a grinding element and a driving connection between said grinding element and said power source, and a carriage, upon ,which said grinding elementL is mounted, said` carriage being mounted for transverse `movement `upon said frame, said carriage and an adjacent portion of the frame being' provided `with opposed contacting members adapted to maintain` a three-point contactbetween carriage and frame,

including two contact points, one adjacent each `side of the carriage and adjacent one side of the frame,anda third contact pointiinterposed between the front and rear of the carriage and intermediate the sides of the frame, the three` points being sufficiently widely spacedito provide a firm support for the carriage as a whole, and roller `means `positioned at such contact points,

`and a plurality of pairs of opposed tracks on said carriage and frame Aadjacent the yfirst two of interposed between such tracks. 1 i

e f 12.` In a track working machine,` a;` frame adapted to span the rails of a track, a plurality of wheels on each side of said frame, adapted to engage the rails ofsaid track, a power source mounted onsaid frame, a grinding element and a driving connection betweensaid grinding element and said power source, `and a carriage,

uponwhich said grinding element is'mounted,

said carriage being mounted for transverse movement `upon said frame, vsaid carriage and an adjacent portion of the frame being provided with opposed contacting members adapted to main-` tain a three-point contact between carriage and frame, including two contact points, one adjae cent each side of the carriage and adjacent one side of the frame, and a third contact point in- `terposed betweenthe front and rear of thecar-V l5 mountedonsaid frame, a grinding element and i riage and intermediate the sides ofthe frame,

1 thethree points being sufciently widelyvspaced to providera rm support for the carriage as a whole, and roller means positioned at such contact points, and yielding means tendingv normally to urge said carriage downwardly toward said frame. a

13. In a track working machine, a frame adapted to span the rails of a track, a plurality oiv wheels on each side of said frame, adapted to engage the rails of said track, a power source mounted on said frame, a grinding element and a driving connection between said grinding element and said power source, and a carriage,

:upon which said grinding element is mounted, vSaid carriage being mounted for transverse movecent each side of the carriage and adjacent one side of ythe frame, and a third Contact point interposed between the front and rear of the carriage and intermediate the sidesof the frame, the three points being suliciently widely spaced -to'provide al rmv support for the carriage as a whole, and roller means positioned at such contact points, and yielding means tending normally to urge said carriage ldownwardly toward said frame, and means for adjusting the thrust `of said yielding means.

carriage.

14. In Y a track working machine, -av frame adapted to span the rails ofa trackfa plurality `of wheels on each side ofgsaid frame, adapted to mounted onv said frame, Va grinding element and a driving connection between said grinding element and saidA power source, and a carriage, upon which saidgrinding element is mounted, said carriage being mounted for transverse movement upon said/frame, said carriage and an adjacent portion of theframe being vprovided with opposed contacting members adaptedV to maintain a three-point contact between carriage and frame, including two contact points, one adjacent each side of the carriage and adjacent one side of the frame, and a third contact point interposed between the front and rear ofthe carriage and intermediate thek sides ofjthe frame, the

three points being sufficiently widely spaced to provide a `iirm support for the carriage as a Whole, and roller means vpositioned at such con- .tact points, and yielding means tending Anormally to urge `said carriage downwardly toward said frame, including rollers engaging portions of said carriage upwardly spaced above said contact points, and means for maintaining a yielding thrust of said rollers downwardly against the carriage, vwhile permitting movement of the HENRY H.' V'IAmaovs -30 

